surface hole
91clearance hole — noun A hole in a surface which is large enough to enable screw threads and shank to pass through …
92daylight hole — A hole in the roof of a cave, reaching the surface [10] …
93Putlog Hole — A hole intentionally left in the surface of a wall for insertion of a horizontal pole. Such holes held scaffolding used during construction, floor joists, or supported hourdings. Hemyock Castle has many such holes …
94air hole — air′ hole n. 1) an opening to admit or discharge air 2) an opening in the frozen surface of a river or pond 3) aer. air pocket • Etymology: 1760–70 …
95Comet Surface Sample Return — est une mission spatiale que l agence spatiale américaine de la NASA envisage de lancer au cours de la décennie 2010 dans le cadre de son programme de missions planétaires à coût intermédiaire programme New Frontiers. La mission de la sonde… …
96sound hole — noun Date: 1611 an opening in the top surface of a stringed instrument (as a violin) to enhance vibration and resonance see violin illustration …
97air hole — an opening in the frozen surface of a water body …
98air hole — 1. an opening to admit or discharge air. 2. a natural opening in the frozen surface of a river or pond. 3. See air pocket. [1760 70] * * * …
99bog hole — Phys. Geog. a land surface depression occupied by waterlogged soil and spongy vegetative material that cannot bear the weight of large animals. [1780 90] * * * …
100swallow hole — the point at which a river channel may disappear underground. Usually found on limestone where joints may come to the surface and provide a conduit into which the river can disappear …
